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function random_password($length = 6)
{
	$characters = array_merge(range('a', 'z'), range('A', 'Z'), range(0, 9));
        srand((float)microtime() * 1000000);
	shuffle($characters);
	return implode('', array_slice($characters, 0, $length));
}

echo random_password();

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[php]
<?php
function random_password($length = 6)
{
	while (strlen($key) < $length) $key .= rand(0,1) ? chr(rand(48, 57)) : chr(rand(97, 122));
	return $key;
}
echo random_password();
?>

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Meir:

<?php

function random_password($length = 6)
{
	$characters = implode('', array_merge(range('a', 'z'), range('A', 'Z'), range(0, 9)));
	$characters = str_repeat(str_shuffle($characters), $length > 62 ? ceil($length/62) : 1);
	return substr($characters, 0, $length);
}

$start = array_sum(explode(' ', microtime()));

for ($i = 0; $i < 10000; $i++) {
	random_password(100);
}

$end   = array_sum(explode(' ', microtime()));
$final = $end - $start;

echo number_format($final, 4, '.', '').' seconds'; // 0.5664 seconds

?>

richardhealy:

<?php

function random_password($length = 6)
{
	while (strlen($key) < $length) $key .= rand(0,1) ? chr(rand(48, 57)) : chr(rand(97, 122));
	return $key;
}

$start = array_sum(explode(' ', microtime()));

for ($i = 0; $i < 10000; $i++) {
	random_password(100);
}

$end   = array_sum(explode(' ', microtime()));
$final = $end - $start;

echo number_format($final, 4, '.', '').' seconds'; // 3.3504 seconds

?>

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function randomString($length = 8, $characters = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-_')
{
    $string = '';
    $max    = strlen($characters) - 1;
    for($i = 0; $i < $length; ++$i) {
        $string .= $characters[mt_rand(0, $max)];
    }
    return $string;
}

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<?php
function random_password($length = 8){
    return substr(str_shuffle('ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-_'),0,$length);
}
?>

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function random_password($length = 6)
{
	$pass = '';
	for($n =0; $n < $length; $n++)
		$pass .= substr('ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-_', rand(0, 63), 1);
	
	return $pass;
}

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function random_password($length = 6)
{
  return substr( md5(microtime()),0, $length);
}

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<?php
	function randomPassword($length = 6){
		$chars = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-_';
		$charsLen = strlen($chars)-1;
		$pass = '';
		
		for($n =0; $n < $length; $n++){
			$pass .= substr($chars, mt_rand(0, $charsLen), 1);
		}
		
		return $pass;
	}
?>

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<?php
function randomPassword($length) {
    $chars = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-_!@#$%^&*(){}[]|~';
    $charsarray = array();
    for ($n=0; $n < rand(0,rand(0,100)); $n++) {
        $charsarray[] = str_shuffle($chars);
    }
    $password = substr(str_shuffle(str_shuffle(implode($charsarray))),rand(0,strlen($password))-$length,$length);
    return $password;
}
echo randomPassword(12);
//Sample generated password: tY$%bSzzU!e[
?>